On Mon, May 23, 2011 at 11:09:21AM +0900, KAMEZAWA Hiroyuki wrote:
>
> Slightly updated against the latest git tree. but didn't update version number.
> ==
> Now, only attach/detatch/update for disks are supporeted for inactive
> domains.
> This patch allows to modify network interfaces of inactive domains.
> Users can modify inactive domains with --persistent flag.
>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
>
> * src/conf/domain_conf.c:
> (virDomainNetInsert) : Insert a network device to domain definition.
> (virDomainNetIndexByMac) : Returns an index of net device in array.
> (virDomainNetRemoveByMac): Remove a NIC of passed MAC address.
>
> * src/qemu/qemu_driver.c
> (qemuDomainAttachDeviceConfig): add codes for NIC.
> (qemuDomainDetachDeviceConfig): add codes for NIC.
>
> Changelog v1->v2:
> - fixed virDomainNetInsert
> - removed target name check. (It seems I misunderstood something.)
> - fixed error check in qemuDomainAttachDeviceConfig
> - fixed error message in qemuDomainDetachDeviceConfig
> ---
> src/conf/domain_conf.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
> src/conf/domain_conf.h | 4 ++++
> src/libvirt_private.syms | 3 +++
> src/qemu/qemu_driver.c | 31 +++++++++++++++++++++++++++++++
> 4 files changed, 83 insertions(+), 0 deletions(-)
>
> diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
> index 6129bbc..d85c8bc 100644
> --- a/src/conf/domain_conf.c
> +++ b/src/conf/domain_conf.c
> @@ -5177,6 +5177,51 @@ int virDomainDiskRemoveByName(virDomainDefPtr def, const char *name)
> return 0;
> }
>
> +int virDomainNetInsert(virDomainDefPtr def, virDomainNetDefPtr net)
> +{
> + if (VIR_REALLOC_N(def->nets, def->nnets + 1) < 0)
> + return -1;
> + def->nets[def->nnets] = net;
> + def->nnets++;
> + return 0;
> +}
> +
> +int virDomainNetIndexByMac(virDomainDefPtr def, const unsigned char *mac)
> +{
> + int i;
> +
> + for (i = 0; i < def->nnets; i++)
> + if (!memcmp(def->nets[i]->mac, mac, VIR_MAC_BUFLEN))
> + return i;
> + return -1;
> +}
> +
> +static void virDomainNetRemove(virDomainDefPtr def, size_t i)
> +{
If i exceeds def->nnets, you may access beyond def->nets, which may
corrupt memory.
> + if (def->nnets > 1) {
> + memmove(def->nets + i,
> + def->nets + i + 1,
> + sizeof(*def->nets) * (def->nnets - (i + 1)));
> + def->nnets--;
> + if (VIR_REALLOC_N(def->nets, def->nnets) < 0) {
> + /* ignore harmless */
> + }
ignore_value() is provided to ignore a return value.
> + } else {
> + VIR_FREE(def->nets);
> + def->nnets = 0;
> + }
> +}
> +
> +int virDomainNetRemoveByMac(virDomainDefPtr def, const unsigned char *mac)
> +{
> + int i = virDomainNetIndexByMac(def, mac);
> +
> + if (i < 0)
> + return -1;
> + virDomainNetRemove(def, i);
> + return 0;
> +}
> +
>
> int virDomainControllerInsert(virDomainDefPtr def,
> virDomainControllerDefPtr controller)
> diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
> index 5fe31d4..f195caa 100644
> --- a/src/conf/domain_conf.h
> +++ b/src/conf/domain_conf.h
> @@ -1360,6 +1360,10 @@ int virDomainDiskDefAssignAddress(virCapsPtr caps, virDomainDiskDefPtr def);
> void virDomainDiskRemove(virDomainDefPtr def, size_t i);
> int virDomainDiskRemoveByName(virDomainDefPtr def, const char *name);
>
> +int virDomainNetIndexByMac(virDomainDefPtr def, const unsigned char *mac);
> +int virDomainNetInsert(virDomainDefPtr def, virDomainNetDefPtr net);
Will it be better to add virDomainNetRemove here as a counterpart of
virDomainNetInsert? Although no external file uses it.
> +int virDomainNetRemoveByMac(virDomainDefPtr def, const unsigned char *mac);
> +
> int virDomainControllerInsert(virDomainDefPtr def,
> virDomainControllerDefPtr controller);
> void virDomainControllerInsertPreAlloced(virDomainDefPtr def,
> diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
> index 7b6151c..eb55025 100644
> --- a/src/libvirt_private.syms
> +++ b/src/libvirt_private.syms
> @@ -290,6 +290,9 @@ virDomainLoadAllConfigs;
> virDomainMemballoonModelTypeFromString;
> virDomainMemballoonModelTypeToString;
> virDomainNetDefFree;
> +virDomainNetIndexByMac;
> +virDomainNetInsert;
> +virDomainNetRemoveByMac;
> virDomainNetTypeToString;
> virDomainObjAssignDef;
> virDomainObjCopyPersistentDef;
> diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
> index 691965d..ef2c5f0 100644
> --- a/src/qemu/qemu_driver.c
> +++ b/src/qemu/qemu_driver.c
> @@ -4245,6 +4245,7 @@ qemuDomainAttachDeviceConfig(virDomainDefPtr vmdef,
> virDomainDeviceDefPtr dev)
> {
> virDomainDiskDefPtr disk;
> + virDomainNetDefPtr net;
>
> switch (dev->type) {
> case VIR_DOMAIN_DEVICE_DISK:
> @@ -4267,6 +4268,24 @@ qemuDomainAttachDeviceConfig(virDomainDefPtr vmdef,
> return -1;
> break;
>
> + case VIR_DOMAIN_DEVICE_NET:
> + net = dev->data.net;
> + if (virDomainNetIndexByMac(vmdef, net->mac) >= 0) {
> + char macbuf[VIR_MAC_STRING_BUFLEN];
> +
> + virFormatMacAddr(net->mac, macbuf);
> + qemuReportError(VIR_ERR_INVALID_ARG,
> + _("mac %s already exists"), macbuf);
> + return -1;
> + }
> + if (virDomainNetInsert(vmdef, net)) {
> + virReportOOMError();
> + return -1;
> + }
> + dev->data.net = NULL;
> + if (qemuDomainAssignPCIAddresses(vmdef) < 0)
> + return -1;
> + break;
> default:
> qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
> _("persistent attach of device is not supported"));
> @@ -4281,6 +4300,7 @@ qemuDomainDetachDeviceConfig(virDomainDefPtr vmdef,
> virDomainDeviceDefPtr dev)
> {
> virDomainDiskDefPtr disk;
> + virDomainNetDefPtr net;
>
> switch (dev->type) {
> case VIR_DOMAIN_DEVICE_DISK:
> @@ -4291,6 +4311,17 @@ qemuDomainDetachDeviceConfig(virDomainDefPtr vmdef,
> return -1;
> }
> break;
> + case VIR_DOMAIN_DEVICE_NET:
> + net = dev->data.net;
> + if (virDomainNetRemoveByMac(vmdef, net->mac)) {
> + char macbuf[VIR_MAC_STRING_BUFLEN];
> +
> + virFormatMacAddr(net->mac, macbuf);
> + qemuReportError(VIR_ERR_INVALID_ARG,
> + _("mac %s doesn't exist."), macbuf);
> + return -1;
> + }
> + break;
> default:
> qemuReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
> _("persistent detach of device is not supported"));
> --
> 1.7.4.1
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